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| 1. |
Which of the following reagent will react with pyrrole to form 2 formyl pyrrole? |
| Answer» HYL 2-thionoester PYRROLE 1A, initially prepared via treatment of the corresponding 2-carboxylate pyrrole with Lawesson's reagent,9 was REACTED with excess 2800 RANEY® nickel to provide the 2-formyl pyrrole 2a in 67% ISOLATED yield (Table 1, entry 1). | |